Pressure vessel closure



FIG. 1 is a top perspective view of a pressure vessel closure, showing my new design.

FIG. 2 is a bottom perspective view of my new design shown in FIG. 1.

FIG. 3 is a top view of my new design shown in FIG. 1.

FIG. 4 is a bottom view of my new design shown in FIG. 1.

FIG. 5 is a side view of my new design shown in FIG. 1.

FIG. 6 is a side view of my new design shown in FIG. 1.

FIG. 7 is a side view of my new design shown in FIG. 1.

FIG. 8 is a side view of my new design shown in FIG. 1; and,

FIG. 9 is a cross-sectional view taken from line 9-9 of FIG. 3.

The broken lines depict portions of the pressure vessel closure that form no part of the claimed design. 

CLAIM The ornamental design for a pressure vessel closure, as shown and described. 